A 30.9 kg rocket has an engine

that creates a 790 N upward force

("thrust"). What is its acceleration?

(Don't forget its weight!)

(Unit = m/s)

acceleration = 15.8 m/s^2

Explanation:

Weight of rocket which acts downward is W = mass * acceleration due to gravity

w = 30.9 * 9.81

W = 303.129 N

force of 790 N acts upward and it is greater than W hence acceleration is in upward direction and is given by Newton's second law of motion as

790 - W = mass * acceleration

790 - 303.129 = 30.9 * acceleration

486.871 = 30.9 * acceleration

acceleration = 486.871 / 30.9

acceleration = 15.756 m/s^2

acceleration = 15.8 m/s^2